Reservoir grease gun



Nov. 26, 1929. I ALBERTiNE 1,737,399

RESERVOIR GREASE GUN Filed April 26, 1926 INVENTOR flermaiz Alfieri i726 112 ATTORNEY Patented Nov. 26, 1929 UNITED? ST TES PATENT. OFFICE HERMAN ALBERTINE, OF E AST"RUTHERFORD;

NEW JERSEY, .ASSIGNOR, BY musing ASSIGNMENTS, '10 ROGERS PRODUCT CO. INC., A CORPORATION OF NEW JERSEY RESERVOIR GREASE GUN Application filed April 26,

particularly in cases where. the duct inlets are normally closed by nipples having ball inlet check valves, as in expired British pat cut to Alley and Woodvine, No. 21,893, of 1906, Oct. 4. I a

My present invention does not necessarily require that the nipples be exteriorly screw-' threaded, as in said British patent, or that they be provided with equivalent bayonet securing means, a? in many other patents, as there are various other forms of nipples and duets, with and without securing means and valves, for which the 'novel features of my device may be readily adapted. In fact, my invention is best applied in connection with guns for pumping grease directly into a nipple, by reciprocating the reservoir end of the device, and there is decided advantage in having no securing means whatever, the charging nozzle being held in face contact with the end of the nipple. Thus, when the reservoir part is manually reciprocated and slides lon 'tudinally on the nozzle stem, the latter wil be free for slight angular yield, thus avoiding lateral strains such as ordinarily result from the hand reciprocation, if -the stem were held in rigid alignment with the nipple. 4

Prior devices of the above type, so far as I am aware, have been more or less complicated and have beenarranged so that the telescoping nozzle member of the pump reciprocates backward into the body of grease in the reservoir and the parts are so arranged 40 that there is very substantial vacuum condition produced on each pumping stroke. Both of these sliding joints and into the body of grease in the reservoir. All of these disadvantages are avoided by my present invention and far quicker and more certain supply of the grease to the pumping cavity or cylinder element is assured.

The above and other features of my invention may be more fully understood from features tend to draw dirt into the.

1926. Serial No. 104,556.

ready for application to the end of a grease duct or to a nipple through which the lubri cant is to be forced; and

Fig. 2 is a detail section on the line 2-2,

In these of my pump is shown as rigidly inounted on the end, 2, of a grease reservoir by means of a coupling member,.3,.at the outer end of which is a ball check, 4, held in place by a disc, 5,.slitt'ed as shown in Fig. 2 to permit passage of the grease. The tube, 6, which is the piston member of the pump reciprocating in the cylinder 1, is surrounded by a spring, 7, normally returnin it to the forward or retracted position. here is an outlet check valve, 8, at the exit end of the piston tube, housed in an enlargement, 9, of the nozzle-member, 10, which is secured to the forward end of the iston, 6, by screw-thread, 11, and is provided with shoulders, 12, af-

fording a guide for this end of the piston" and also serving as an abutment for thrust of spring 7. The shoulder, 12, is shown as havin its outward movement limited by a spun mannulus, 13, at the forward end of thecylinder element 1. This nozzle element, 10, is formed with an axial passage, 14, which terminates at its forward end in a flaring cone, 15','adapted for endwise engagement with the inlet end of' the nipple into which the grease is to be pumped, and saidcone is preferably surrounded by still flatter cone surface, 16, which is useful as an assistance in guiding the nozv zle cone, 15, into operative engagement with said end of the nipple. The grease reservoir may be of an desired construction and is conventionally's own as including a cylinder, 20, iiifetachably screwed into the end closure, 2,ja'ndpermanently closed at the other end plug, 21. Within the cylinder, I preferably'provide a. iston, 22, against which the grease is packed in the initial charging of the device. While the pump will operate by itsown suction to' drawings, the cylinder member, 1, I

drawa supply fromsuch reservoir, I prefer to-have the piston backed by a spring, 23,

- and there may be a handle as 24, for retractple fitting such as is commonly used on such grease ducts, although, of course, screw fittings or other coupling means can be employed if desired. Thereupon, the nozzle being held against endwise movement, and the rest of the structure being pushed forward, the cylinder, l,-will be pushed along the piston 6, compressing the spring 7 and expel- ;ling grease past the outlet check valve, 8, and

through the'nozzle orifice at 15. The hand pressure bein then relieved, the spring, 7, will continue holding the nozzle in firm contact with the nipple, while the cylinder element, 1, is being retracted. At the beginning of the retracting'movement, the outlet check valve, 8, will automatically seat and inlet check. 4 will automatically open, whereupon the pressure applied upon the grease V .in the reservoir by spring 23 through piston 22 will operate to feed grease into the cylinv,der cavit until the retraction movement is complete Thereupon, a second forcing movement will automatically cause closure of valve 4 and opening of valve 8, as first above described.

Preferably, the pressure applied by the spring 23 on the grease of the reservoir will prior devices.

, be sufficient-to very'materially assist the filling of the pum cylinder, 1, in response to the suction of t e piston, 6, and a desirable feature being that it is effective for this purpose during the entire retracting stroke instead of at the end of the stroke, as in certain If it is desired to use the device with a ver powerful spring, or with a thin lubricant liaving small flow resistance, it is a simple matter to-relieve the lubricant in the reservoir from the pressure of piston 22, by retracting it, to draw a locking pin, 25,

through the slots, 26, and then rotate the hanv dle a half turn to bring the pin 25 into looking engagement with the slot 27, which is shown in dotted line.

It will be evident that the moving element, the piston, in my pump, cannot possibly deliver dirt into the grease reservoir. Moreover, if an dirt can find its way past the bearing sur ace of shoulder 12, no harm can result, certainly not for a very long time,

because it would have to work itsway' the length of the'spring cavity before it could even reach the piston head. If it should reach this point, it is practically impossible for it to penetrate farther inward, because the only time the piston travels inward in the proper direction, the internal cavity is subject to the great internal pressure applied on the grease, and if there is any leakage, it will be outward leakage of grease, tending to carry dirt away from the interior.

I claim:

Lubricating means, including "a reservoir and piston means for force feeding grease through a non-return valve and into a pump cylinder ofrelatively small internal diameter having an extension guide portion of larger diameter affording an intermediate annular shoulder, and, in combination with said parts, a correlatively shaped piston tube having its inlet end slidably engaging within said pump cylinder and an annular enlargement slidably fitting within said cylinder enlargement; a spiral thrust spring surrounding and closely embracing the exterior of, the piston tube and positioned within the cylinder enlargement and compressed between the cylinder shoulder and the piston enlargement to press the piston outward; a non-return valve for the outlet of the piston passage and;

a terminal thrust surface for engagement with and thrust against a device to be lubricated.

Signed at New York city in the county of New York and State of New York, this 22 day of April, A. D. 1926.

HERMAN ALBERTI NE. 

